Draft: ci/lava: Detect R8152 network issues and retry

Implement a log-based retry hint for R8152 issue described in #6681 (closed), which is based on detecting these two consecutive lines:

r8152 <USB> eth0: Tx status -71
nfs: server <IP> not responding, still trying

Where and could be any IP and USB addresses, respectfully.

This MR is a temporary fix since it requires a section-aware log follower, implemented in !16323 (merged). When the cited MR is merged, one will make a proper fix on top of that.

Closes: #6681 (closed)

Update

Put on draft since !16323 (merged) should be merged soon so that I will put this MR on top of it.